NCED Electrical Systems & Wiring 2

Question 1

What is the standard color code for the neutral wire in US residential wiring?

Accepted Answer

White

Answer

In US residential wiring, the neutral wire is white, the hot wire is black (or red), and the ground wire is green or bare copper.

Question 2

A GFCI outlet is required by the NEC in which of the following locations?

Accepted Answer

Bathrooms

Answer

NEC requires GFCI protection in wet or damp locations including bathrooms, kitchens near sinks, garages, and outdoor areas.

Question 3

Which wire gauge is typically used for a 20-amp branch circuit in US residential wiring?

Accepted Answer

12 AWG

Answer

12 AWG copper wire is rated for 20 amps, while 14 AWG is used for 15-amp circuits.

Question 4

What does 'overcurrent protection' prevent in an electrical circuit?

Accepted Answer

Excessive current that could cause overheating and fire

Answer

Overcurrent protection devices (fuses and breakers) interrupt the circuit when current exceeds safe levels, preventing overheating and fire.

Question 5

In a series circuit, if one component fails (open circuit), what happens to the other components?

Accepted Answer

All components stop working

Answer

In a series circuit, current has only one path; an open in any component breaks the entire loop, stopping current flow everywhere.

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